U.S. patent application number 11/829894 was filed with the patent office on 2009-01-15 for motor assembly for ceiling fan.
Invention is credited to Chien Hsun CHEN.
Application Number | 20090015111 11/829894 |
Document ID | / |
Family ID | 40252507 |
Filed Date | 2009-01-15 |
United States Patent
Application |
20090015111 |
Kind Code |
A1 |
CHEN; Chien Hsun |
January 15, 2009 |
MOTOR ASSEMBLY FOR CEILING FAN
Abstract
A motor assembly for ceiling fans includes a top cover having a
plurality of protrusions extending from a top thereof, a bottom
cover and a ring-shaped member connected between the top cover and
the bottom cover so as to form a case. A shaft rotatably extends
through the top cover and the bottom cover. A stator is fixed to
the shaft and located in the case, and a permanent magnet is fixed
to an inner periphery of the ring-shaped member. A light detection
device is connected to the frame and includes a light detection
member. A circuit board is located in the light detection device.
The protrusions pass through the light detection member to block a
light beam emitted from the light detection member to activate the
light detection member to send a signal to the circuit board to
count the revolution of the shaft.
Inventors: |
CHEN; Chien Hsun; (Taichung,
TW) |
Correspondence
Address: |
SINORICA, LLC
528 FALLSGROVE DRIVE
ROCKVILLE
MD
20850
US
|
Family ID: |
40252507 |
Appl. No.: |
11/829894 |
Filed: |
July 28, 2007 |
Current U.S.
Class: |
310/68B ;
310/68R; 310/73; 310/89; 416/244R |
Current CPC
Class: |
H02K 11/22 20160101 |
Class at
Publication: |
310/68.B ;
310/73; 310/68.R; 310/89; 416/244.R |
International
Class: |
H02K 5/04 20060101
H02K005/04; H02K 11/00 20060101 H02K011/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 13, 2007 |
TW |
096211389 |
Claims
1. A motor assembly comprising: a top cover having a plurality of
protrusions extending from a top thereof; a bottom cover connected
to the top cover with a ring-shaped member connected between the
top cover and the bottom cover so as to form a case; a shaft
rotatably extending through the top cover and the bottom cover, a
stator fixed to the shaft and located in the case, a permanent
magnet fixed to an inner periphery of the ring-shaped member, and a
frame connected to the shaft and located above the top cover, a
light detection device connected to the frame and including a light
detection member located at an underside of the light detection
device, a circuit board located in the light detection device, the
protrusions passing through the light detection member to block a
light beam emitted from the light detection member.
2. The assembly as claimed in claim 1, wherein the top cover
includes a plurality of first holes defined through a peripheral
flange thereof and the bottom cover includes second holes defined
through a peripheral flange thereof, bolts extend through the first
and second holes and connected with nuts.
3. The assembly as claimed in claim 1, wherein the top cover
includes a plurality of first stubs extending from an underside
thereof and the bottom cover includes a plurality of second stubs
extending from a top thereof, the first and second stubs are in
contact with an inside of the ring-shaped member.
4. The assembly as claimed in claim 1, wherein the protrusions are
integrally connected to the top cover.
5. The assembly as claimed in claim 1, wherein the protrusions are
connected to the top cover by glue.
6. The assembly as claimed in claim 1, wherein the protrusions are
connected to the top cover by rivets.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a DC motor for a ceiling
fan and includes light detection members to survey rotation of the
motor.
BACKGROUND OF THE INVENTION
[0002] A conventional motor assembly for ceiling fans is shown in
FIG. 7 and generally includes a case composed of a top cover 70 and
a bottom cover 71 which is connected with the top cover 70 so as to
receive a permanent magnet 700 in the case. A shaft 72 rotatably
extends through the top cover 70 and the bottom cover 71 and a
stator 73 is fixed to the shaft 72. The stator 73 is provided
electromagnetic force so as to cause changes of the magnetic field
relative to the permanent magnet 700 to rotate the shaft 72.
However, the conventional motor assembly can only be operated
between on and off, and this single operation mold cannot meet
requirements of the latest ceiling fans. Besides, once the motor
assembly is stopped, it can only be re-started from the first stage
of revolution of the ceiling fans. The user cannot re-start the
ceiling fan from the second stage of revolution directly.
[0003] The present invention intends to provide a motor assembly
which includes a light detection device connected to the shaft and
the top cover includes protrusions which block the light emitted
from the light detection device so as to survey the revolution of
the motor and an information of revolution is sent to the circuit
board so as to activate the motor assembly when re-started.
SUMMARY OF THE INVENTION
[0004] The present invention relates to a motor assembly which
comprises a top cover having a plurality of protrusions extending
from a top thereof and a bottom cover is connected to the top cover
with a ring-shaped member connected between the top cover and the
bottom cover so as to form a case. A shaft rotatably extends
through the top cover and the bottom cover, a stator is fixed to
the shaft and located in the case. A permanent magnet is fixed to
an inner periphery of the ring-shaped member. A frame is connected
to the shaft and located above the top cover, a light detection
device is connected to the frame and includes a light detection
member which is located at an underside of the light detection
device. The protrusions pass through the light detection member to
block a light beam emitted from the light detection member so as to
count the number of revolution of the shaft and the information of
the revolutions is sent to a circuit board is located in the light
detection device.
[0005] The present invention will become more obvious from the
following description when taken in connection with the
accompanying drawings which show, for purposes of illustration
only, a preferred embodiment in accordance with the present
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 is a perspective view to show the motor assembly of
the present invention;
[0007] FIG. 2 is an exploded view to show the motor assembly of the
present invention;
[0008] FIG. 3 is a cross sectional view to show the motor assembly
of the present invention;
[0009] FIG. 4 is a cross sectional view to show that the shaft of
the motor assembly of the present invention rotates and the
protrusions pass through the light detection members;
[0010] FIG. 5 is a cross sectional view to show another embodiment
of the way that the protrusions are fixed to the top cover;
[0011] FIG. 6 is a cross sectional view to show yet another
embodiment of the way that the protrusions are fixed to the top
cover, and
[0012] FIG. 7 is a cross sectional view to show the conventional
motor assembly.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0013] Referring to FIGS. 1 to 3, the motor assembly for ceiling
fans of the present invention comprises a top cover 10 having a
plurality of protrusions 12 integrally extending from a top thereof
and a plurality of first dents 13 are formed on the top of the top
cover 10 so as to form first stubs 14 extending from an underside
of the top cover 10. A bottom cover 60 is connected to the top
cover 10 with a ring-shaped member 50 connected between the top
cover 10 and the bottom cover 60 so as to form a case. A permanent
magnet 51 is fixedly connected to an inner periphery of the
ring-shaped member 50. The bottom cover 60 includes a plurality of
second dents 63 defined in an underside thereof so as to form a
plurality of second stubs 64 extending from a top of the bottom
cover 60. The first and second stubs 14, 64 are in contact with an
inside of the ring-shaped member 50 so as to position the
ring-shaped member 50.
[0014] The top cover 10 includes a plurality of first holes 15
defined through a peripheral flange thereof and the bottom cover 60
includes second holes 65 defined through a peripheral flange
thereof. Bolts 150 extend through the first and second holes 15, 65
and are connected with nuts 650 by respective threaded sections 151
of the bolts 150 to firmly connect the top cover 10, the bottom
cover 60 and the ring-shaped member 50.
[0015] The top cover 10 includes a first bowl-shaped portion on the
top thereof and a first central hole 11 is defined through the
first bowl-shaped portion. A first recessed area is defined by the
first bowl-shaped portion in the underside of the top cover 10. The
bottom cover 60 includes a second bowl-shaped portion and a second
central hole 61 defined through the second bowl-shaped portion. A
second recessed area 62 is defined by the second bowl-shaped
portion in the top of the bottom cover 60. Two bearings 21 are
respectively located in the first and second recessed areas and a
shaft 20 rotatably extending through two bearings 21, the top cover
10 and the bottom cover 60.
[0016] A stator 40 is fixed to the shaft 20 and located in the case
and located corresponding to the permanent magnet 51 fixed to the
ring-shaped member 50.
[0017] A frame 30 is connected to the shaft 20 and located above
the top cover 10. The frame 30 includes a fan-shaped support member
31 and a light detection device 32 is connected to the fan-shaped
support member 31 on the frame 30. The light detection device 32
includes a light detection member 321 located at an underside of
the light detection device 32 and a circuit board 320 is located in
the light detection device 32. Further referring to FIG. 4, the
light detection member 321 is an inverted U-shaped member so that
when the shaft 20 rotates, the protrusions 12 pass through the
light detection member 321 to block a light beam emitted from the
light detection member 321 so as to count the number of revolution
of the shaft 20. The information of the revolution of the shaft 20
is sent to the circuit board 320 and the control circuit of the
circuit board 320 is electrically connected with the switch or the
like so that the user can demand the number of revolution of the
shaft 20 whenever re-starting the ceiling fan.
[0018] The protrusions 12 can be connected to the top cover 10 by
glue 120 as shown in FIG. 5 or the protrusions 12 can be connected
to the top cover 10 by rivets 121 as shown in FIG. 5.
[0019] While we have shown and described the embodiment in
accordance with the present invention, it should be clear to those
skilled in the art that further embodiments may be made without
departing from the scope of the present invention.
* * * * *